Sight-arm attachment for excavating-machines



FIG 1 c. L. GEORGE.

Patented Nov. 1, 192L.

2 SHEETS-SHEET kb I O a INVENTOR a M i.

WW I C. L. GEORGE.

SIGHT ARM ATTACHMENT FOR EXCAVATING MACHINES. APPLICATION FILED (JCT. 14. I920.

. 1,395,810. Patented Nov. 1, 1921.

. 2 SHEETS-SHEET 2- FIG. 5

INVENT OR FIG. 4*

srarnsh ASS-IGNOR TO THE BUCKEYE TRACTION OHIO, A CORPORATION OF OHIO.

. SIGHT-ARM,ATTACHMENT FOR EXCAVATING-MACI-IINES.

Specification of Letters latent.

Patented Nov. 1, rear. 7

Application filed October 14, 1920. Serial No. 416,853.

To all whom it ay concern:

Beit known'that I, CHARLES L. Grown, a citizen of the United States, and a res dent of Findlay, in the county of Hancock and State of Ohio, have made an invention appertaining to Sight-Arm Attachments for Excavating-lltachines; and I do hereby declare the following to be a full, clear, and exactedesc'ription of theinvention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanylng drawings, and to the characters of reference marked thereon, which form a part of this specification.

This invention relates to trench digging or excavating machines and particularly to a sight-arm attachment for use in connection therewith.

It will be understood that in the use of sight-arms in connection with machines of this character it'is the practice to maintain a predetermined depth oftrench by keeping, a sight-arm on the machine on a level with a set of ground stakes or level finders positioned in the line of the trench.

The object of my invention is the provision of a sight-arm attachment for use In connection with the pivoted chain carrying frames or booms of excavating machines of the bucket and chain type, which attachment is simple and efficient in its construction and easily and quickly'adjustable relative to the carrying frame to suitthe depth at which itis desired to dig a trench.

The invention is fully described in the following specification, and while, in its broader aspect it is capable of embodiment in'numerous forms, a preferred embodiment thereof is illustrated in the accompanying drawings, in which Figure '1 is a sideelevation of an excavating machine embodying the invention, with parts removed. Fig. 2 is an enlarged sectional detail of a portion of the sightarm adjusting means, with parts broken away. Fig. 3 is a fragmentary side elevation thereof. Fig. 41 is an outer end elevation of the sight-arm carrying frame with its sight-arm suspended therefrom. Fig. 5 is an enlarged fragmentary side elevation of the sight-arm carrying frame and its adjustable support Fig. 6 is an enlarged top plan view of the forward end portion of the sight-arm carrying frame and sight arm attached, and, Fig.

7 is a plan view of the sight arm carrying frame with the sight arm and adjusting means in connection therewith and with parts broken away.

Referring to the drawings,

1 designates ing a pair of transversely spaced longitudinally extendln bars 9 and connecting cross pieces 10, is pivoted at its inner end adjacent to the frame pivots 6, and in thepresent instance to brackets 11 projecting from the frame 5, and projects rearwardly from such brackets over the frame-5 for vertical swingingj movement. g he sight-arm frame is supported in adjusted relation to the frame 5 by a pair of bars 12, which pivotally rise from respective ca an excavating machine frame supported by 1 front and rear sets of wheels 2 and 3, the

sides of the frame 5 and slidably' project at their upper ends through pivoted guide blocks 13 carried by the frame 8. The v blocks 13, in the present instance, have journal portions 14 Fig. 2 mounted inthe respective ends of a tubular cross-member 15, which connects the bar 9, 9 of the frame 8 intermediate the ends thereof and in the present instance adjacent to their'forward ends, and is rigidly attached to said bars b U-bolts 16 Figs. 3 and 5. A locking pin 17 is mounted in each end portion of the cross member 15 and projects at its outer end through the respective block 13 in intersectin relation to the opening thereof through which the adjusting bar 12 projects. The

bars 12 have a plurality of longitudinally I projecting inwardly therefrom to near the center of the cross-member 15 and thence around a respective sheave'21 and laterally from the member 15 through a side Opening therein, the cables thence extending to any suitable point for operation of the same. The sheaves 21 are carried by the cros member 15 partially within the opening thereof. It is evident that to change the adjustment of the sight-arm carrying frame 8 with respect to the bucket chain carrying frame 5, it ig'only necessary to pull on the cables 20 to simultaneously withdraw the locking pins 17, 17 from the supporting bars 12, '12, and to then move the frame 8'to the desired position when the locking pins are released to engage a registering set of openings in the bars 12.

The frame 8 at lts outer end carries an L-shaped member 22, one end of which connects and is pivotally mounted in the forward ends of the frame bars 9, 9, while the other arm of the member 22 hangs down and carries a laterally projecting sight arm 23. The arm 23 is adjustable longitudinally of the pendant arm of the'member 22 and is secured in adjusted position by a set screw 24, or in any other suitable manner.

It is evident-in the use of my invention that the greater the depth of the. trench being dug the greater will be the angle be-.

' tween the frames 5 and 8, which angle is obtained by arelative adjustment of the frame 8 and supporting bars 12. 7 It is also evident that the level of the'trench being dug is maintained by sighting across the arm 23 and alining it with the sight por-" tions of the ground stakes.

I wish it understood that my'invention is not limited to any specific construction, arrangement or form of the parts, as it is capable of numerous modifications and changes without departing from the spirit of the claims.

Having thus described my invention, what I cla1m as new, and desire to secure by Let-. .ters Patent, 1s,-

1. In an excavating machine, a truck frame, a bucket cham carrying boom pivotally pro ecting from the truck frame, for

vertical swinging adjustment, a sight-arm the bars to retain justment and carrying a sight-arm at its. .outer end, and ad ustable means connecting the boom and frame for maintaininga predetermined relative adjustment thereof.

3. In an excavating machine, a truck frame, a bucket chain carrying boom and a sight-arm carrying frame projecting in the same direction from the truck frame for vertical swinging movements relative to the truck frame and to each other, supporting bars pivotally rising from the boom at the sides of the frame in sliding connection therewith, and manually operable means carried by the frame for releasably engaging them in adjusted relation to the frame. f f

f. In an excavating machine, a bucket swinging adjustment, a sight-arm carryin frame pivotally projecting rearwardly o the boom from -apivot adjacent to its inner end and for vertlcal swinging adjustment relative thereto, a cross member carried by ends of the cross member for vertical rock ing movements relative thereto and having openings therethrough, supporting bars piv:

locking members carriedfby thecross memher and operable to releasably engage the bars within the blocks to retain them in adjusted relation;

In testimony whereof I have hereunto signed my name to this specification,

CHARLES LQ eaonen chain carrying boom mounted for vertical 2 the frame, blocks pivotally carried byther .otallyrising from the boom andslidingly projecting through the block openings,'and 

